DALLAS (WBAP/KLIF) – Three people were killed early Saturday morning in a high speed accident on Mountain Creek Parkway. Dallas Police investigators say they were southbound on the Parkway when they failed to negotiate a curve, ran off the road, hit a large fiberglass cylinder, and were vaulted into the air. Their pickup truck then slammed into a utility pole, and was crushed when it came crashing down on its roof. All three people in the truck were dead at the scene.